When topdecking a Border Guard with Horn, there is no way to choose which Border Guard to topdeck. This usually doesn't matter, except with Prince. It seems that the system automatically chooses to topdeck the first Border Guard played, which is of course the Princed one and exactly the one you probably didn't want to topdeck.
Building an interface to properly resolve this and related bugs sounds hard. But I think there should be an easy effective fix here: just default to topdecking the last Border Guard instead.
Building an interface to properly resolve this and related bugs sounds hard. But I think there should be an easy effective fix here: just default to topdecking the last Border Guard instead.